Table 6. — Occurrence of 3-year-old Coliunbia River blueback salmon 



Rock Isl. dam counts 



Year 



Total 

 run 



Large 

 fish 



Small 

 fish 



Rock Isl. small fish 

 ^-Qf fof 



Total 



totfkL Rock Is. 

 run count 



Vfenatchee ^ of SgO 

 River Okanogan 

 system River 1/ Okanogan 



1951 201*, 369 89,733 



1952 320,362 104,206 



1953 260,079 99,565 

 195** 178,581 76, 7 W 



1955 244,879 145,461 



1956 202,240 74,563 



1957 156,000-^ 63,733 



12,093 101,826 5.9 



9,480 113,686 3.0 



52,182 151,747 20.1 



14,486 91,234 8.1 



7,601 155,062 3.9 



17,880 92,443 8.8 



7,528 71,261 4.8 



1/ Estimates. 



100 



O 80 

 o 



O 



60 



O 40 

 UJ 



a. 



20 — 



0*" 



FIGURE 4 DISTRIBUTION OF BLUEBACK SALMON ON THE 

 OKANOGAN RIVER SPAWNING GROUNDS, 1952-1957 



^AAA 



\ 



1952 



T^T^ 



^i 





\\\v 



k\\\ 



^•> 



1953 



1954 



1955 



1956 



1957 



SECTION 

 ^A-E 



mni M-N 



INT . -DUP . SEC . . WASH . . DC. -j e i* 3 • 



